This is because each column shares an x axis, and each row shares a y axis.įixed scales make it easier to see patterns across panels free scales make it easier to see patterns within panels. scales = "free": x and y scales vary across panels.įacet_grid() imposes an additional constraint on the scales: all panels in a column must have the same x scale, and all panels in a row must have the same y scale.scales = "free_y": the y scale is free, and the x scale is fixed.scales = "free_x": the x scale is free, and the y scale is fixed.The following examples show how to use this function with the built-in mpg dataset in R. This function uses the following basic syntax: library (ggplot2) ggplot(df, aes (xvar, yvar)) + geompoint() + facetwrap(vars(categoryvar)).
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